/*
 * Copyright (C) 2009 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.everrest.core.impl.provider.json;

import java.io.StringWriter;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;

/**
 * @author <a href="mailto:andrew00x@gmail.com">Andrey Parfonov</a>
 * @version $Id$
 */
public class ObjectValue extends JsonValue {

    /** Children. */
    private final Map<String, JsonValue> children = new LinkedHashMap<String, JsonValue>();

    /** {@inheritDoc} */
    @Override
    public void addElement(String key, JsonValue child) {
        children.put(key, child);
    }

    /** {@inheritDoc} */
    @Override
    public boolean isObject() {
        return true;
    }

    /** {@inheritDoc} */
    @Override
    public Iterator<String> getKeys() {
        return children.keySet().iterator();
    }

    /** {@inheritDoc} */
    @Override
    public JsonValue getElement(String key) {
        return children.get(key);
    }

    /** {@inheritDoc} */
    @Override
    public String toString() {
        StringWriter w = new StringWriter();
        JsonWriter jw = new JsonWriter(w);
        try {
            writeTo(jw);
        } catch (JsonException e) {
            throw new RuntimeException(e.getMessage(), e);
        }
        return w.toString();
    }

    /** {@inheritDoc} */
    @Override
    public void writeTo(JsonWriter writer) throws JsonException {
        writer.writeStartObject();
        for (String key : children.keySet()) {
            writer.writeKey(key);
            JsonValue v = children.get(key);
            v.writeTo(writer);
        }
        writer.writeEndObject();
    }

}
